While QPST and QFIL are the applications that provide a GUI for flashing firmware, the driver that allows these applications to "see" the device in Emergency Mode is none other than the (or its variants: HS-USB Diagnostics 9091, 900E, etc.).
While v10 is the standard, alternatives exist: qualcomm flash loader v10
Restores devices stuck in bootloops or "hard-bricked" states where the OS won't load. While QPST and QFIL are the applications that
In fact, starting with Windows 10 version 1803, Microsoft began actively blocking older Qualcomm diagnostic drivers (pre-v10) via Driver Block Rules. To install v10 on modern Windows, you must explicitly disable Secure Boot or driver signature enforcement—a significant red flag for enterprise environments. etc.). While v10 is the standard